Unknown plant matter/moss at base

This is my first grow so maybe this is no big deal but wanted to double-check. This moss-like plant matter is growing next stem at the base and the bottom of the stalk is slightly white. Anyone know what this stuff is and if it's bad for the plant? Any info on getting rid of it, if it is bad, and explaining what it is would be awesome. Thank you.
The soil is mostly coco coir but received the plant in regular soil since it was a clone, so 90% coco and 10% standard potting soil. I have been using nutrients and sprayed insecticide and fungicide on it the other day.